import pygame.font
from pygame.sprite import Group
from ship import Ship

class Scoreboard():
    """显示得分信息的类""" 

    def __init__(self, ai_settings, screen, stats): 

        """初始化显示得分涉及的属性""" 
        self.screen = screen 
        self.screen_rect = screen.get_rect() 
        self.ai_settings = ai_settings 
        self.stats = stats # 显示得分信息时使用的字体设置 
        self.text_color = (30, 30, 30) 
        self.font = pygame.font.SysFont(None, 48) # 准备初始得分图像 
        
        self.prep_score()
        self.prep_high_score()
        self.prep_level()
        self.prep_ships()

    def prep_score(self): 
        """将得分转换为一幅渲染的图像""" 
        rounded_score = int(round(self.stats.score, -1)) 
        score_str = "{:,}".format(rounded_score) 
        self.score_image = self.font.render(score_str, True, self.text_color, self.ai_settings.bg_color)
        
        self.score_rect = self.score_image.get_rect() 
        self.score_rect.right = self.screen_rect.right - 20 
        self.score_rect.top = 20

    def show_score(self): 
        """在屏幕上显示得分""" 
        self.screen.blit(self.score_image, self.score_rect)
        self.screen.blit(self.high_score_image, self.high_score_rect)
        self.screen.blit(self.level_image, self.level_rect)
        # 绘制飞船 
        self.ships.draw(self.screen)

    def prep_high_score(self): 
        """将最高得分转换为渲染的图像""" 
        high_score = int(round(self.stats.high_score, -1)) 
        high_score_str = "{:,}".format(high_score) 
        self.high_score_image = self.font.render(high_score_str, True, self.text_color, self.ai_settings.bg_color) #将最高得分放在屏幕顶部中央 
        self.high_score_rect = self.high_score_image.get_rect() 
        self.high_score_rect.centerx = self.screen_rect.centerx 
        self.high_score_rect.top = self.score_rect.top

    def prep_level(self):
        """将等级转换为渲染的图像""" 
        self.level_image = self.font.render(str(self.stats.level), True, self.text_color, self.ai_settings.bg_color) # 将等级放在得分下方 
        self.level_rect = self.level_image.get_rect() 
        self.level_rect.right = self.score_rect.right 
        self.level_rect.top = self.score_rect.bottom + 10

    def prep_ships(self): 
        """显示还余下多少艘飞船""" 
        self.ships = Group() 
        for ship_number in range(self.stats.ships_left): 
            ship = Ship(self.ai_settings, self.screen) 
            ship.rect.x = 10 + ship_number * ship.rect.width 
            ship.rect.y = 10 
            self.ships.add(ship)